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/*
* Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.ExecutionException;
import java.io.IOException;
/**
* A Future representing the result of an I/O operation that has already
* completed.
*/
final class CompletedFuture<V> implements Future<V> {
private final V result;
private final Throwable exc;
private CompletedFuture(V result, Throwable exc) {
this.result = result;
this.exc = exc;
}
static <V> CompletedFuture<V> withResult(V result) {
return new CompletedFuture<V>(result, null);
}
static <V> CompletedFuture<V> withFailure(Throwable exc) {
// exception must be IOException or SecurityException
if (!(exc instanceof IOException) && !(exc instanceof SecurityException))
exc = new IOException(exc);
return new CompletedFuture<V>(null, exc);
}
static <V> CompletedFuture<V> withResult(V result, Throwable exc) {
if (exc == null) {
return withResult(result);
} else {
return withFailure(exc);
}
}
@Override
public V get() throws ExecutionException {
if (exc != null)
throw new ExecutionException(exc);
return result;
}
@Override
public V get(long timeout, TimeUnit unit) throws ExecutionException {
if (unit == null)
throw new NullPointerException();
if (exc != null)
throw new ExecutionException(exc);
return result;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return true;
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
}
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